I think it's mostly been fine for people. You should upgrade, though, because there are no more security patches being performed on your version, and you're at risk from hacks as well as plugin conflicts. Also the longer you wait, the harder it will be to upgrade everything, so it's best not to let things wait too long.

Uploaded wordpress today for first time - immediately got message to upgrade. Looks like much of the function is not working even after reloading 3 times. Getting error messages like invalid post type when trying to click on all posts from post menu, doesn't want to open headers to change says, cannot load custom headers. I've only loaded this so I could write a blog page and link to my existing website, but doesn't look like I will ever get that far. I am just being dum? Any ideas out there??